复合添加(Ca,Mg)-α-Sialon的晶胞参数研究  

Study on Lattice Parameters of (Ca,Mg)- α-Sialon

作　　者：王佩玲[1] 贾迎新[1] 张骋[1] 孙维莹[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050

出　　处：《无机材料学报》2000年第1期67-72,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金!59632100;中国科学院基础局重点项目!KJ952-JE-509

摘　　要：利用高分辨率的Ｇｕｉｎｉｅｒ－Ｈａｇｇ相机和计算机控制的底片扫描及数据处理程序系统，测定了复合添加，组份为（Ｃａ０．５Ｍｇ０．５）xＳｉ１２－３ｘAl3xＯｘＮ１６－ｘ（ｘ＝０．３、０．６、１．０和１．４）的α－Ｓｏａｌｏｎ的晶胞参数．材料由热压工艺制备而得．研究结果表明，当ｘ≥１．０时，材料的主晶相为α－Ｓｉａｌｏｎ和含Ｍｇ的ＡlＮ多型体．（Ｃａ，Ｍｇ）－α－Ｓｉａｌｏｎ的晶胞参数明显低于相同组份下的Ｃａ－α－Ｓｉａｌｏｎ的晶胞参数·ＥＤＡＸ的结果进一步给出固溶进入α－Ｓｉａｌｏｎ的包括名义组份中９０％的Ｃａ＋＋和少量的Ｍｇ＋＋，而大部分Ｍｇ＋＋进入ＡlＮ多型体，这一结果为净化α－Ｓｉａｌｏｎ陶瓷的晶界提供了新的有效途径．By using Guinier-Hagg camera, computer-linked scanner system and associated programs, the lattice parameters ofα-Sialon for the compositions (Ca_0.5Mg_0.5)_xSi_3-xAl_xO_xN16-xwith x ranging from 0.3 to 1.4 were determined. The samples were prepared by hot pressing technique. The results showed that the crystalline phases in the sintered materials consist ofα-Sialonand Mg-containing AIN-polytypoid when x is equal to or greater than 1.0 and the lattice parameters of (Ca,Mg)-a-Sialon are obviously smaller than Ca-α-Sialon with the same compositions.EDAX results further revealed that 90% of added Ca^++ and small amount of Mg^++ are incorporated intoα-Sialon. This result combined with the fact of formation of magnesium-containingAIN-polytypoid phase in (Ca,Mg)- α-Sialon samples can provide a valid approach to reduce theamount of glassy phase at the grain boundary.

关 键 词：多型体 晶胞参数 SIALON陶瓷 钙 镁 氮化铝 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]